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Objective

Massive stars are the cornerstone of the dynamic and chemical evolution of the cosmos, enriching it as they evolve with chemically processed material that is blown away from their surface by energetic winds and eruption processes. Despite their importance, their evolution from cradle to death as spectacular supernova explosions still poses many mysteries due to crucial knowledge gaps in the physical processes taking place in their interior and atmosphere and the mutual influence by close-by siblings.

Our ultimate goal is to elucidate the physical properties and evolution of massive stars impacted by companions, as well as their contribution to the generation of gravitational waves. For this, we have established a multidisciplinary, international network of researchers from Europe and America with expertise in various disciplines, and with background in both theory and observations. We exploit the avalanche of public data archives and develop machine learning algorithms to detect massive stars in binary and multiple systems, classify them, and create statistically meaningful samples for diverse evolutionary states. We develop progressive methods of signal processing for the analysis of the stellar properties, and cutting-edge numerical codes to unveil the impact of stellar interaction and mass ejection on the evolution of the stars and stellar systems.

The acquired results will significantly enhance our knowledge and lead to major advancements in all related fields. The bulk of exchanges will be undertaken by PhD students and Postdocs, whom we will educate and train in modern observing and data analysing techniques, machine learning algorithms, and in high-performance computing, equipping them with excellent skills for their future careers.

We organise schools, workshops and educational activities to share knowledge as well as disseminate our results, which will be major breakthroughs and will expand Europe's leading role in basic research.


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News

Secondments

Elisson de Almeida from ON visits ASU (14 July - 16 August 2026)

Dissemination

OCEANS team members from ASU, UV, UANL, and UNRN participated in the 42nd Liège Astrophysical Colloquium, “To Be or not to Be: Understanding the Star, the Disk, and the Stripped Companions”, held in Liège, Belgium (13-17 July 2026)

Secondments

Anahí Granada from UNRN visits ASU (8 July - 7 August 2026)

Communication & Dissemination

Olga Maryeva from ASU and Carlos Alberto Guerrero Peña from UANL participated in the outreach event Astronomy on Tap (7 July 2026)

Secondments

Carlos Guerrero from UANL visits ASU (29 June - 31 July 2026)

Research Stay

Martina I. Tapia-Reina from UNC-OAC went for a 10-day research visit to UNRN (June 2026)

Communication

Silvina Cardenas from UNLP and Gaston Escobar from IAC participated at the Astronomy on Tap event (4 June 2026)

Sergio Simón-Díaz from IAC participated in the Soñando Estrellas program on Radio Canarias (21 May 2026)

Outreach

OCEANS team members from ASU participated in the organization and implementation of the outreach event Open Days at ASU (15-16 May 2026)

Secondments

Melina Fernandez from UNLP visits ASU (13 May - 2 October 2026)

Silvina Belén Cárdenas from UNLP visits IAC (23 April - 1 July 2026)

Dissemination

OCEANS members attend the SEEDS conference, Córdoba, Argentina (22-24 April 2026)

Consortium Meeting

The OCEANS Mid-Term Meeting takes place at Observatorio Astronómico de Córdoba, Córdoba, Argentina (20-21 April 2026)

Communication

Members of ICATE presented the OCEANS project during the Crear Conciencia festival (11 April 2026)

Dissemination

Nilesh Pandey from ASU presented his PhD project during the Meeting of Students of Astronomy and Astrophysics in Plzeň (10 April 2026)

OCEANS members from UNC-OAC and ASU participated in the Friends of Friends meeting in Córdoba, Argentina (6-10 April 2026)

Secondments

Bogumił Pilecki from CAMK visits UNC-OAC (15 April - 12 May 2026)

Matheus Bernini Peron from UHEI visits UNC-OAC (13 April - 12 May 2026)

Sergio Simón-Díaz from IAC visits UNLP (12 - 17 April 2026)

Gonzalo Holgado from IAC visits UNLP (12 - 17 April 2026)

Carlos Martínez Sebastián from IAC visits UNLP (12 - 17 April 2026)

Michaela Kraus from ASU visits UNC-OAC (9 April - 7 May 2026)

Olga Maryeva from ASU visits UNC-OAC (5 April - 4 May 2026)

Yael Aidelman from UNLP visits IAC (1 April - 3 June 2026)

Outreach Activity

Public talk for amateur astronomers in Bariloche by Olga Maryeva (ASU) during outreach event organized by Anahí Granada (UNRN) (17 March 2026)

Secondments

Sara Cuellar Carrillo from UMAYOR visits IAC (11 March - 12 April 2026)

Alba Casasbuenas from IAC visits ON (10 March - 2 May 2026)

Education Activity

Sergio Simón-Díaz from IAC gives lectures at five high-schools in Madrid promoting stellar astrophysics

Dissemination

Michalis Kourniotis from ASU presented an invited talk at the Masaryk University in Brno (9 March 2026)

Communication & Dissemination

Research stay of A. Sander, G. Gonzalez-Tora, and J. Josiek from UHEI at the National Astronomical Observatory of Japan (6-23 March 2026)

Secondments

Olga Maryeva from ASU visits UNRN (5 March - 4 April 2026)

Daniela Turis from UV visits CAMK (13 February - 16 March 2026)

Felipe Ignacio Ortiz Arredondo from UV visits UHEI (12 February - 16 March 2026)

Felipe Figueroa from UV visits UHEI (12 February - 16 March 2026)

Winter School

WS-IAC

Team members from IAC are organizing a Winter School on massive stars

Secondments

Matías Montesinos Armijo from UTFSM visits ASU (23 January - 25 February 2026)

Daniela Turis Gallo from UV visits IAC (11 January - 12 February 2026)

Felipe Ignacio Ortiz Arredondo from UV visits IAC (11 January - 11 February 2026)

Felipe Figueroa from UV visits IAC (11 January - 11 February 2026)

Michalis Kourniotis from ASU visits UNLP (4 January - 3 February 2026)